Finding the Fourth Proportional to 64,978.74, 89,671.41 and 38,121.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,978.74 : 89,671.41 = 38,121.72 : x
2. Step 2: Convert to fraction form
   64,978.74/89,671.41 = 38,121.72/x
3. Step 3: Cross multiply
   64,978.74x = 89,671.41 × 38,121.72
4. Step 4: Simplify right side
   64,978.74x = 3,418,428,384.03
5. Step 5: Solve for x
   x = 3,418,428,384.03/64,978.74
6. Step 6: Final answer
   x = 52,608.41